golang-redis之string类型简单操作

1：安装redigo

go get github.com/garyburd/redigo/redis

2：连接redis(通过ip端口)

c, err := redis.Dial("tcp", "192.168.2.225:6379")
if err != nil {
    fmt.Println("connect to redis err", err.Error())
    return
}
defer c.Close()

3：命令执行

n,err := c.Do("SET","key","value")  //写
result,err := redis.String(c.Do("GET","key"))//读

4：string类型常见操作

set(key, value)：给数据库中名称为key的string赋予值value
get(key)：返回数据库中名称为key的string的value
getset(key, value)：给名称为key的string赋予上一次的value
mget(key1, key2,…, key N)：返回库中多个string的value
setnx(key, value)：添加string，名称为key，值为value
setex(key, time, value)：向库中添加string，设定过期时间time
mset(key N, value N)：批量设置多个string的值
msetnx(key N, value N)：如果所有名称为key i的string都不存在
incr(key)：名称为key的string增1操作
incrby(key, integer)：名称为key的string增加integer
decr(key)：名称为key的string减1操作
decrby(key, integer)：名称为key的string减少integer
append(key, value)：名称为key的string的值附加value
substr(key, start, end)：返回名称为key的string的value的子串

5：示例
5.1：SET-GET示例
设置key-value(“myname”,”Alice”)

_,err = c.Do("set","myname","Alice")
if err != nil{
    fmt.Println("redis set failed",err.Error())
}
myname,err := redis.String(c.Do("GET","myname"))
if err!= nil{
    fmt.Println("redis get failed",err.Error())
}else{
    fmt.Println("GET myname",myname)
}

5.2：GETSET示例
调用GETSET时，返回的是key值原来的value值，调用之后，该值被修改为现有的值

mydb,err = redis.String(c.Do("GETSET","mydb","mysql"))
if err != nil{
    fmt.Println("getset failed",err.Error())
}
fmt.Println("get before",mydb)
mydb,err = redis.String(c.Do("get","mydb"))
if err == nil{
    fmt.Println("mydb:",mydb)
}

5.3：SETNX示例

_,err = c.Do("setnx","foo","bluegogo")
if err != nil{
    fmt.Println("setnx failed",err.Error())
}
foo,err := redis.String(c.Do("get","foo"))
if err == nil{
    fmt.Println("setnx value",foo)
}

5.4：MSETNX-MGET示例
MSETNX设置不存在的key的值，如果该值存在，则值不会修改

_,err=c.Do("msetnx","bike1","ofo","bike2","bluegogo","bike3","foo")
if err != nil{
    fmt.Println("setnx failed")
}
var tmpbike1 string
var tmpbike2 string
var tmpbike3 string
array,err =redis.Values( c.Do("MGET","bike1","bike2","bike3"))
if err != nil{
   fmt.Println("mget failed",err.Error())
}else{
if _,err=redis.Scan(array,&tmpbike1,&tmpbike2,&tmpbike3);err == nil{
    fmt.Println("mget :",tmpbike1,tmpbike2,tmpbike3)
 }
}

5.5：MSET-MGET示例

_,err=c.Do("mset","bike1","mongo","bike2","redis","bike3","memcached")
if err != nil{
    fmt.Println("mset error",err.Error())
}
array,err =redis.Values( c.Do("MGET","bike1","bike2","bike3"))
if err != nil{
    fmt.Println("mget failed",err.Error())
}else{
if _,err=redis.Scan(array,&tmpbike1,&tmpbike2,&tmpbike3);err== nil{
        fmt.Println("mget :",tmpbike1,tmpbike2,tmpbike3)
   }
 }

5.6：SETEX-SET（定时）示例

_,err = c.Do("setex","ofo",10,"xiaoming")
if err != nil{
    fmt.Println("setex failed ",err.Error())
}
ofo,err := redis.String(c.Do("get","ofo"))
if err == nil{
    fmt.Println("setex ofo",ofo)
}
time.Sleep(11 *time.Second)
ofo,err = redis.String(c.Do("get","ofo"))
if err == nil{
     fmt.Println("setex ofo",ofo)
 }else{
    fmt.Println("time out get nil")
}

_,err = c.Do("SET","myage",10,"EX","10")
if nil != err{
    fmt.Println("redis set failed",err.Error())
}   
isExist,err := redis.Bool(c.Do("EXISTS","myage"))
if err != nil{
    fmt.Println("error",err.Error())
}else{
    fmt.Println("exists or not ",isExist)
}
time.Sleep(11*time.Second)
myage,err := redis.String(c.Do("GET","myage"))
if err != nil{
    fmt.Println("redis get failed",err.Error())
}else{
    fmt.Println("get myage",myage)
}
isExist,err = redis.Bool(c.Do("EXISTS","myage"))
if err != nil{
    fmt.Println("error",err.Error())
}else{
    fmt.Println("10s after exists or not ",isExist)
}

5.7：INCR-INCRBY示例

_,err = c.Do("SET","myage",10)
if err != nil{
    fmt.Println("set myage failed",err.Error())
}
myage,err = redis.String(c.Do("GET","myage"))
if err == nil{
    fmt.Println("before myage",myage)
}
_,err=c.Do("INCR","myage")
if err != nil{
    fmt.Println("incr error",err.Error())
}
myage,err = redis.String(c.Do("GET","myage"))
if err == nil{
    fmt.Println("after myage incr 1",myage)
}
_,err=c.Do("INCRBY","myage",10)
if err != nil{
    fmt.Println("incrby error",err.Error())
}
myage,err = redis.String(c.Do("GET","myage"))
if err == nil{
   fmt.Println("after myage incr 10",myage)
}

5.8：DECR-DECRBY示例

 myage,err = redis.String(c.Do("GET","myage"))
if err == nil{
     fmt.Println("before myage",myage)
 }
 _,err=c.Do("DECR","myage")
 if err != nil{
     fmt.Println("incr error",err.Error())
 }
 myage,err = redis.String(c.Do("GET","myage"))
 if err == nil{
     fmt.Println("after myage DECR 1",myage)
 }
_,err=c.Do("DECRBY","myage",10)
if err != nil{
     fmt.Println("incrby error",err.Error())
}
myage,err = redis.String(c.Do("GET","myage"))
if err == nil{
    fmt.Println("after myage DECR 10",myage)
}

5.9：APPEND示例

_,err = c.Do("APPEND","bike1","xiaomingbike")
if err != nil{
    fmt.Println("append error",err.Error())
}
bike1,err := redis.String(c.Do("GET","bike1"))
if err == nil{
    fmt.Println("get bike is",bike1)
}

5.10：SUBSTR示例

str,err := redis.String(c.Do("substr","bike1",1,4))
if err != nil{
    fmt.Println("substr get err",err.Error())
}
fmt.Println("substr is",str)

5.11：DEL示例

_,err = c.Do("DEL","myname")
if err != nil{
    fmt.Println("redis delete failed",err.Error())
}       
myname,err = redis.String(c.Do("GET","myname"))
if err != nil{
fmt.Printf("redis get failed %s  delete success\n",err.Error())
}else{
fmt.Println("delete failed")
}

github完整示例

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